[JDaniel]

I had a similar problem 2 years ago. The speedo would not work when car was really cold (ie. less than 40f). The tach always worked. Sometimes the speedo would catch when shifting through the gears, but it would usually stay dead until car warmed up... I noticed this for several weeks, and then as I decided to fix the problem, it went away.

This fall it returned.

Since shifting has a tendency to cure the problem, I think it might be a loose connection or wires touching. I put the car away for the winter and will tackle the failing speedo in the spring when I drop the motor for the "Top-End".

Sorry I couldn' t be more help. If you solve the problem let me know the solution.